Airmail Box (1930-4)

Blue airmail boxes were introduced in 1930 and were designed to advertise the General Post Office’s (GPO) new airmail service. Airmail pillar boxes had much later and more extensive posting times than regular boxes, and postage rates were much higher than standard post. By 1936, there were 139 airmail boxes in London and 174 in other towns and cities due to the expansion of the advertising of the service.